Help with my Email List

I have a growing list of 2 million opt-in emails, an IEM setup with 255 ip rotations, etc.

My problem is, i'm having issues warming up my IP's. After about a month of warming up, i'm still not inboxing.

My question is, are there any services I can pay to use that already have high inbox rates?

I really don't want to waste my IEM server setup, but it's really turning out to be a struggle.
I understand that services like MailChimp require opt-in emails upon upload, and I don't want to do that.

Any advice? Please don't ask me where I get my data, it should be relatively self-explanatory.

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